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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2dc244f57e7c74b5898cdd100a088dc5348aae1dbb1f7a44ab1c1f698c1c2e6' 
  AND token = 'WEfaDlF5Wu3bT5ellnMm1v3KdWwvznxUslsO94umOQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}